Volume: 37, 2015

Number: 3

The cover image taken by Virginia McLemore shows a Carbonatite dike (brown) intruding Proterozoic diorite in the Lemitar Mountains, Socorro County, New Mexico. The carbonatite has been dated by Ar/Ar methods as 517.7±0.7 Ma. REE are mined from large carbonatite plutons at Mountain Pass, California and Bayan Obo, Inner Mongolia, China.